Liquid caustic soda (sodium hydroxide, NaOH) is a clear, colorless aqueous solution

Typical Commercial Specification (50% Membrane Grade)

• Purity as NaOH: 49.5% – 51.0% (Standard 50% nominal; technical grades may start at 47% min)
• Appearance: Clear, colorless, odorless liquid
• Sodium Chloride (NaCl): < 100 ppm (Membrane grade) / up to 1.1% max (Diaphragm grade)
• Sodium Carbonate (Na₂CO₃): 150 – 500 ppm max
• Iron (as Fe): 2.0 – 5.0 ppm max
• Specific Gravity: ~1.52 at 20°C (for 50% solution) [1, 2, 3, 4, 5, 6]

Key Physical & Chemical Properties

• Chemical Formula: NaOH
• Molecular Weight: 40.00 g/mol
• CAS Number: 1310-73-2
• UN Number: UN1824 (Sodium Hydroxide Solution)
• Hazard Class: Class 8 (Corrosive, Packing Group II)
• Freezing/Crystallization Point: Begins to crystallize around 12°C for a 50% solution (lower concentrations freeze at different thresholds). [1, 2, 3]

Caustic Soda Lye 10L

Caustic Soda (Sodium Hydroxide)

Caustic soda has become a common ingredient in the production of many everyday items.

Commonly known as lye, it has been used to make soap for centuries.

Caustic soda, also known as lye or sodium hydroxide, has many uses, including in the food, textile, and chemical industries.

Food industry

Processing: Caustic soda is used in the processing of foods.

Cleaning: Caustic soda is used to clean ovens and grills.

Textile industry

Separating impurities: Caustic soda is used to remove impurities from fibers.

Bleaching: Caustic soda is used to bleach fabrics.

Scouring: Caustic soda is used to scour yarn.

Removing natural oil: Caustic soda is used to remove natural oil from textile fibers.

Caustic Soda Lye 10L